ChistStudioAll tools
19 free, instant, browser-based tools. No signup required.
Network & IP
Subnet Calculator
CIDR to netmask, host range, broadcast address.
DNS Lookup
Query A, AAAA, MX, TXT and NS records.
My IP & Geolocation
Your public IP, ISP and approximate location.
MAC Address Vendor Lookup
Identify hardware manufacturer from a MAC address.
ASN / BGP Lookup
Autonomous system and network operator for an IP.
WHOIS Domain Lookup
Registration, registrar and expiry for a domain.
Dev & security
JWT Decoder
Inspect header and payload claims of a JWT.
Base64 Encode / Decode
Convert text and Base64, UTF-8 safe.
JSON Formatter
Validate, pretty-print or minify JSON.
Regex Tester
Test a pattern with live match highlighting.
Password Strength & Breach Check
Local scoring plus anonymous breach lookup.
Security Headers Analyzer
Check a site's HTTP security headers.
SSL Certificate Checker
TLS certificate trust, issuer and expiry.
Hash Generator
SHA-1, SHA-256, SHA-384, SHA-512 digests.
Utility